KR102099836B1 - Motor - Google Patents

Abstract

The present invention provides a motor capable of preventing a core and a permanent magnet from being damaged in a radial direction. The motor includes: a stator; and a rotor rotatably arranged inside or outside the stator, wherein the rotor includes: a plurality of rotor core segments provided on an inner side or an outer side of the stator while being spaced apart from each other in a circumferential direction of the rotor so as to form a plurality of permanent magnet arrangement slots, and having holes formed in a direction parallel to an axial direction of a rotation shaft coupled with the rotor, respectively; a plurality of permanent magnets inserted into the permanent magnet arrangement slots, respectively, such that the permanent magnets are alternately arranged with the rotor core segments in the circumferential direction of the rotor; and a rotor frame configured to fix the rotor core segments and the permanent magnets, and having a plurality of rotor frame pins inserted into the holes, respectively. The rotor frame includes: a base surrounding the rotor core segments and the permanent magnets in the direction parallel to the axial direction of the rotation shaft; and a plurality of permanent magnet fixing jig holes formed only at an inner end of the base among inner and outer ends of the base to expose the permanent magnets.

Description

Motor {MOTOR}

The present invention relates to a motor.

The motor refers to a device that provides a rotating shaft with a rotational force generated by electromagnetic interaction between the stator and the rotor. In order to generate rotational force, a coil is wound on the stator, and when a current is applied to the coil, the rotor rotates. The motor can be used in various fields such as washing machines, refrigerators, compressors, and vacuum cleaners. For example, the motor can be connected to the drum of the washing machine by the rotating shaft to realize the rotation of the drum.

In general, a permanent magnet type motor may be classified into a surface mounted type and an interior permanent magnet according to the type of attachment of the permanent magnet. The surface-attached type refers to a form in which a permanent magnet is attached to the surface of the rotor core. The embedded type refers to a form in which a permanent magnet is embedded in the rotor core. Among the embedding type, the form in which the rotor core and the permanent magnet are erected along a height direction parallel to the axial direction of the rotating shaft may be sub-classified as a spoke type.

The spoke-type motor has an advantage of improving the efficiency and performance of the rotor through the concentration effect of the magnetic flux using the rotor core. However, when the rotational speed of the rotating shaft generated in the spoke-type motor is excessively fast, there is a fear that the structural strength of the rotor is lowered. For example, the rotating shaft of the motor installed in the washing machine rotates at a faster speed than other strokes during the dehydration stroke, and sometimes exceeds 1,200 rpm.

When the rotating shaft of the motor is excessively rotated, a strong centrifugal force acts on the rotor of the motor. In addition, due to this strong centrifugal force, the permanent magnet of the rotor or the rotor core may be broken in the radial direction of the rotor. In order to solve this problem, in Korean Patent Application Publication No. 10-2012-0110275 (2012.10.10.2012), which is a prior patent document, the permanent magnet 140 and the rotor core 131 are disposed above and below as the first fastening member 152. And, the structure for disposing the rotor core 131 through the second fastening member 153 is disclosed.

When the rotating shaft of the motor rotates at a slow speed, the structure disclosed in the prior patent document uses the two fastening members 152 and 153 and the rotor housing 150 to remove the permanent magnet 140 and the rotor core 131. Can be prevented. However, since the first fastening member 152, the second fastening member 153, and the rotor housing 150 are composed of separate parts from each other, when the rotation axis of the motor rotates at a very high speed, due to a lack of physical coupling force between the parts The possibility of breakage is very high.

In addition, since the first fastening member 152 is disposed above and below the permanent magnet 140 and the rotor core 131, it causes the motor to increase in size.

In addition, in order to manufacture the structure of the prior patent document, the rotor housing 150, the rotor core 131, the permanent magnet 140, the first fastening member 152, the second fastening member 153, etc. Therefore, it should be assembled sequentially. In this respect, the productivity is very low, and particularly, as the number of fastening members increases, it is disadvantageous for mass production.

Furthermore, a hole must be formed in the rotor core in order to join a plurality of fastening members. Excessive increase in the hole will cause the performance of the rotor core to provide a path of magnetic flux.

It is to propose a motor having a structure that can prevent the core and permanent magnets from being damaged in the radial direction. In particular, the present invention is to propose a structure that can improve the structural strength of the motor without causing a reduction in performance or size of the motor.

The present invention is to provide an optimum shape, an optimal size, and various optimum ratios of a rotor core segment and a permanent magnet that do not cause a reduction in rotor performance while improving the structural strength of the rotor.

The present invention is to provide a configuration that allows the rotor core segment and the permanent magnet to be stably installed in place, and to maintain its bonding state securely.

The motor of the present invention includes a rotor, and the rotors are arranged to be spaced apart from each other along the circumferential direction of the rotor so as to form a plurality of permanent magnet placement slots, and a direction parallel to the axial direction of the axis of rotation coupled to the rotor A plurality of rotor core segments having a hole formed toward; And a plurality of permanent magnets inserted one by one into the plurality of permanent magnet arrangement slots so as to be alternately arranged one by one with the plurality of rotors along the circumferential direction of the rotor. And a rotor frame formed to fix the plurality of rotor core segments and the plurality of permanent magnets, and including a plurality of rotor frame pins inserted into the holes, wherein the rotor frame is parallel to the axial direction of the rotation axis. A base formed to surround the plurality of rotor core segments and the plurality of permanent magnets in one direction; And a plurality of permanent magnet fixing jig holes formed only on the inner end of the inner and outer ends of the base so as to expose the plurality of permanent magnets.
The ratio (A / B) of the diameter (A) of the hole and the straight line distance (B) between both sides of the rotor core segment is 0.4 to 0.7.

The motor includes a stator and a rotor rotatably disposed inside or outside the stator.

The rotor further includes a rotor frame, and the rotor frame is formed to fix the plurality of rotor core segments and the plurality of permanent magnets, and includes a rotor frame pin inserted into the hole.

Each of the plurality of rotor core segments may include a body having the hole; A head protruding to both sides from the inner end of the body toward the circumferential direction of the rotor; And protrusions protruding from the outer end of the body and extending in two directions toward a direction away from each other to form a rotor core slot, wherein the hole is formed of the inner end of the body and the rotor core slot in the radial direction of the rotor. Is formed between.

The straight distance between the hole and the rotor core slot based on the radial direction of the rotor is 0.45 mm or more.

The rotor core segment is formed by lamination of a sheet of electrical steel sheet, the body has a pulse formed around the hole, and the pulse is projected from one surface of each electrical steel sheet, and recessed from the other surface of the same position It is formed, the straight line distance between the hole and the pulse is 0.45mm or more.

The straight line distance (B) between both sides of the body is formed to gradually move toward the outside of the rotor core segment, and the straight line distance (C) between both sides formed on the outside of the two protrusions is outside the rotor core segment. It is formed to gradually move away, and the straight line distance (C) between both sides formed on the outer side of the two projections is farther away from the straight line distance (B) between both sides of the body.

Each of the plurality of permanent magnets includes: a first working surface facing the circumferential direction of the rotor; And a second working surface forming a boundary between the first working surface and an obtuse angle, wherein a side surface of the body is in surface contact with the first working surface, and a side surface of the protrusion is in surface contact with the second working surface. It forms the boundary between the side and the obtuse angle of the body.

The obtuse angle is 190 ° to 230 °.

The radial length D of the second working surface based on the radial direction of the rotor is the difference between the radial length E of the permanent magnet and the radial length F of the first working surface (D = EF), and the ratio (D / E) of the radial length (D) of the second working surface and the radial length (E) of the permanent magnet is 0.15 to 0.35.

The plurality of rotor core segments and the plurality of permanent magnets each have first and second ends located opposite to each other in a direction parallel to the axial direction of the rotating shaft, and the rotor frame is in the axial direction of the rotating shaft. A first end base formed to surround the first end in a parallel direction; And a second end base formed to surround the second end in a direction parallel to the axial direction of the rotating shaft, wherein the length (G) of the rotor frame pin in the direction parallel to the axial direction of the rotating shaft is the first It is shorter than the distance H between the first stage base and the second stage base (G <H).

The plurality of rotor core segments and the plurality of permanent magnets each have first and second ends located opposite to each other in a direction parallel to the axial direction of the rotating shaft, and the rotor frame is in the axial direction of the rotating shaft. A first end base formed to surround the first end in a parallel direction; A second stage base formed to surround the second stage in a direction parallel to the axial direction of the rotating shaft; And a plurality of permanent magnet fixing jig holes formed on one inner end of the first end base and the second end base to expose the plurality of permanent magnets.
The plurality of permanent magnet fixing jig holes are formed only at the inner end of the inner and outer ends of the first stage base, and the plurality of permanent magnet fixing jig holes are formed only at the inner ends of the inner and outer ends of the second stage base. do.
The rotor frame has a plurality of inner pillars extending in a direction parallel to the axial direction of the rotation axis to connect the inner ends of the first end base and the inner ends of the second end base to each other, and fixing the plurality of permanent magnets A jig hole is formed for each boundary between the first end base and the plurality of inner columns, or is formed for each boundary between the second end base and the plurality of inner columns.

The plurality of permanent magnet fixing jig holes are formed at positions spaced from each other along the circumferential direction of the rotor frame.

The plurality of rotor core segments and the plurality of permanent magnets each have first and second ends located opposite to each other in a direction parallel to the axial direction of the rotating shaft, and the rotor frame is in the axial direction of the rotating shaft. A first end base formed to surround the first end in a parallel direction; A second stage base formed to surround the second stage in a direction parallel to the axial direction of the rotating shaft; And a plurality of rotor frame holes formed in any one of the first end base and the second end base, and formed at positions facing the rotor frame pins in a direction parallel to the axial direction of the rotation axis.

Each of the plurality of permanent magnets includes an inner surface disposed to face the stator; And an outer surface disposed to perform the opposite side of the inner surface, wherein the ratio (I / J) of the length (I) of the outer surface and the length (J) of the inner surface based on the circumferential direction of the rotor is 0.6 to 0.8.

The straight line distance K between both sides of the rotor core segment gradually increases toward the outer end of the rotor core segment, and both sides of the rotor core segment are symmetrical to each other based on the radial direction of the rotor.

The straight line distance K between both sides of the rotor core segment gradually increases toward the outer end of the rotor core segment, and one of both sides of the rotor core segment is formed parallel to the radial direction of the rotor, and the rotor The other of both sides of the core segment is formed to be inclined with respect to the radial direction of the rotor.

Each of the plurality of permanent magnets has two working surfaces facing opposite to each other, one of the two working surfaces is formed as a concave curved surface, and the other of the two working surfaces is formed as a convex curved surface, and the Each of the plurality of rotor core segments includes: a first side surface formed in a convex curved surface to make surface contact with a concave working surface of a permanent magnet disposed on one side of the rotor core segment in a circumferential direction of the rotor; And a second side surface formed in a concave curved surface in surface contact with the convex working surface of the permanent magnet disposed on the other side of the rotor core segment in the circumferential direction of the rotor.

Each of the plurality of rotor core segments may include a body having the hole; A head protruding to both sides from the inner end of the body toward the circumferential direction of the rotor; And protrusions projecting to both sides from the outer end of the body toward the circumferential direction of the rotor.

According to the present invention having the above configuration, by providing optimal conditions for the position, size, shape, etc. of holes, rotor core slots, and pulses formed in the rotor core segment, the rotor is not caused to deteriorate or increase in performance of the motor. It can improve the structural strength. In particular, according to the present invention, the structure strength of the rotor can be secured despite the structure in which a plurality of rotor core segments are completely spaced apart from each other and a structure in which a plurality of permanent magnets are completely spaced apart from each other. .

In addition, the present invention provides a structure capable of preventing scattering of the rotor core segment and the permanent magnet from each other. With this structure, the number of holes formed in the rotor frame can be minimized, thereby improving the structural strength of the rotor.

In addition, the present invention proposes a structure that stably positions the rotor core segment and the permanent magnet in a fixed position and maintains the position in consideration of the shape in which the insert is injected from the mold. The dimensional stability and reliability of the completed rotor can be secured.

1 is a perspective view showing an embodiment of a motor related to the present invention.
FIG. 2 is a perspective view showing a state in which the rotor shown in FIG. 1 is cut along an axial direction.
3 is an exploded perspective view of the rotor.
4 is an enlarged partial perspective view of a portion IV shown in FIG. 3.
5 is a plan view of the rotor core segment and the permanent magnet.
6 is a plan view showing another embodiment of the rotor core segment and the permanent magnet.
7 is a plan view showing another embodiment of the rotor core segment and the permanent magnet.
8 is a plan view showing another embodiment of the rotor core segment and the permanent magnet.
9 is a plan view showing another embodiment of the rotor core segment and the permanent magnet.

Hereinafter, the motor according to the present invention will be described in more detail with reference to the drawings.

In the present specification, the same or similar reference numerals are assigned to the same or similar configurations in different embodiments, and the description is replaced with the first description.

When an element is said to be "connected" or "connected" to another component, it is understood that other components may be directly connected to or connected to the other component, but may exist in the middle. It should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that no other component exists in the middle.

The singular expression used in this specification includes the plural expression unless the context clearly indicates otherwise.

1 is a perspective view showing an embodiment of a motor 100 related to the present invention.

The motor 100 includes a stator 110 and a rotor 120.

The stator 110 includes a stator core 111, an insulator 112, and a coil 113.

The stator core 111 is formed by stacking a plurality of sheets of electrical steel sheets along the axial direction of a rotating shaft coupled to the motor 100. The stator core 111 may be configured to surround the rotating shaft at a position spaced apart from the rotating shaft.

The insulator 112 is coupled to the stator core 111 on one side and the other side (up and down) along a direction parallel to the axial direction of the rotating shaft (not shown) (up and down in FIG. 1). The insulator 112 is formed of an electrically insulating material. The insulator 112 has a stator fixing portion 112a and a tooth insulating portion 112b.

The stator fixing part 112a protrudes from the circumference of the insulator 112 toward the rotation axis. The stator fixing part 112a is formed in plurality. The plurality of stator fixing parts 112a are formed at positions spaced apart from each other along the circumference of the insulator 112. The stator fixing portion 112a is formed with a fastening member fixing hole that opens in a direction parallel to the axial direction of the rotating shaft. The position of the stator 110 is fixed as the fastening member is coupled to the fastening member fixing hole.

The tooth insulation portion 112b protrudes in the radial direction from the circumference of the insulator 112. The tooth insulating part 112b insulates the coil 113 from a tooth connected to a yoke (not shown) by wrapping a tooth (not shown) in which the coil 113 is wound.

The coil 113 is wound on each tooth insulation 112b. In Fig. 1, the focus is shown. The coil 113 is applied with electric current. The motor 100 is operated by the current applied to the coil 113.

The rotor 120 is rotatably disposed inside or outside the stator 110. The inner and outer sides are determined to face the rotation axis disposed at the center in the radial direction of the rotor 120 or vice versa. The direction toward the rotation axis is inside, and the direction away from the rotation axis is outside. In FIG. 1, the rotor 120 shows an outer rotor 120 disposed outside the stator 110.

The rotor 120 includes a rotor frame 121. The rotor frame 121 may be referred to as a rotor housing. The rotor frame 121 is formed to surround the stator 110.

The rotor frame 121 includes a bushing coupling portion 121a, a spoke 121b, and an outer wall 121e.

The bushing coupling part 121a is formed to be coupled to a rotation axis passing through an area enclosed by the stator 110. The bushing coupling part 121a is formed at the center of the rotor frame 121 in the radial direction of the rotor 120. The center of the rotor frame 121 corresponds to a position facing the area enclosed by the stator 110.

The bushing coupling portion 122a is formed to be coupled to the bushing 122. The bushing (122) refers to a component connected to the rotating shaft. One end of the rotating shaft is coupled to the bushing 122, and the other end can be directly connected to an object receiving the rotational force of the motor 100, such as a drum of a washing machine.

The bushing 122 may have a shape conforming to a hollow cylinder. The bushing 122 is provided with a thread 122a on the inner circumferential surface of the hollow so as to be coupled with the rotating shaft. The rotating shaft is directly inserted into the bushing 122. The rotating shaft and the rotor frame 121 are coupled to each other through the bushing 122.

A reinforcement rib 122a1 is formed around the bushing coupling portion 122a. The reinforcing ribs 122a1 are formed in plurality around the bushing coupling portion 122a, and the plurality of reinforcing ribs 122a1 protrude from the boundary between the bushing coupling portion 122a and the spoke 122b along a direction inclined to the rotation axis. do.

The spokes 121b extend in the radial direction from the bushing coupling portion 121a, or extend in an acutely inclined direction with respect to the radial direction. The spokes 121b are provided in plural, and may be arranged around the bushing coupling parts 121a to face different directions. The spoke 121b is formed at a position covering one side or the other side of the stator 110 in a direction parallel to the axial direction of the rotation axis. Referring to FIG. 1, it can be seen that the lower side of the stator 110 corresponds to the one side, and the upper side of the stator 110 corresponds to the other side. In this case, the spoke 121b is formed at a position covering the lower side of the stator 110 from below.

When the plurality of spokes 122b are formed in the radial direction around the bushing coupling portion 122a, a heat dissipation hole 122b1 is formed between the plurality of spokes 122b. Heat generated in the motor due to the operation of the motor may be discharged through the heat dissipation hole 122b1.

The outer wall 121e is formed to surround the stator 110 in the radial direction of the rotor 120. A plurality of rotor cores 123 and a plurality of permanent magnets 124, which will be described later, are installed inside the outer wall 121e.

For reference, in FIG. 1, the spoke 121b type motor 100 having the outer rotor 120 has been described, but the present invention necessarily includes the spoke 121b type motor 100 having the outer rotor 120. ) Is not limited to. For example, the present invention can be applied to an embedded motor having an inner rotor 120.

Components of the reference numerals not described in FIG. 1 will be described with reference to FIG. 2 showing only the rotor 120 except for the stator 110.

FIG. 2 is a perspective view showing a state in which the rotor 120 shown in FIG. 1 is cut along an axial direction.

3 is an exploded perspective view of the rotor 120.

4 is an enlarged partial perspective view of a portion IV shown in FIG. 3.

The rotor 120 includes a plurality of rotor cores (or rotor core blocks, or rotor core segments) 123, a plurality of permanent magnets 124, and a rotor frame 121.

The plurality of rotor cores 123 are arranged to be spaced apart from each other along the circumferential direction of the rotor 120 on the outside of the stator 110 to form a permanent magnet placement slot MS. As the plurality of rotor cores 123 are arranged to be spaced apart from each other along the circumferential direction of the rotor 120, permanent magnet placement slots MS are formed between the two rotor cores 123. Permanent magnet placement slot (MS) is the side of the two rotor cores 123 disposed adjacent to the permanent magnet placement slot (MS), the head 123b of the two rotor cores 123, and the two rotor cores 123. It is an area enclosed by the projection 123c.

The plurality of rotor cores 123 are formed by stacking a plurality of sheets of electric steel sheets along a direction parallel to the axial direction of the rotating shaft. The sheets of electrical steel sheets may have the same shape. However, at least one electric steel plate disposed at the bottom and at least one electric steel plate disposed at the top based on the stacking direction of the electric steel plate may be larger than other electric steel plates for supporting the permanent magnet 124.

If the rotor core 123 having a height of 39 mm is to be formed of a sheet of electric steel sheet having a thickness of 0.5 mm in a direction parallel to the axial direction of the rotation axis, 78 electrical steel plates may be stacked.

The rotor core 123 serves to concentrate the force of the permanent magnet 124. When the force of the permanent magnet 124 is concentrated on the rotor core 123, the performance of the motor 100 increases dramatically. However, if a plurality of rotor cores 123 are connected to each other, the efficiency of the motor 100 is reduced. Therefore, in order to improve the efficiency of the motor 100, it is preferable that the plurality of rotor cores 123 are spaced apart from each other.

Referring to FIG. 3, each rotor core 123 includes a body 123a, a head 123b, a protrusion 123c, a hole 123d, a rotor core slot (or rotor core block slot, or rotor core segment) Slot) 123e, and a mac 123f.

The body 123a corresponds to a portion occupying the largest volume of the rotor core 123. The body 123a is disposed to face the permanent magnet 124 in the circumferential direction of the rotor 120. Both sides of the body 123a are disposed to face the first working surface 124a of the permanent magnet 124, and are in surface contact with the first working surface 124a.

It can be understood that the plurality of rotor cores 123 are arranged along the side surface of the hollow cylinder. The portion located on the circumference corresponding to the inner diameter of the cylinder corresponds to the inner end of the body 123a. Further, the outer end of the body 123a points to a portion where the protrusion 123c and the rotor core slot 123e, which will be described later, are formed. The inner end of the body 123a is disposed to face the stator 110 at a position spaced apart from the stator 110.

The width of the body 123a based on the circumferential direction of the rotor 120 may be formed to gradually widen from the inner end to the outer end of the body 123a. For example, the linear distance between both sides of the body 123a in the circumferential direction of the rotor 120 gradually increases as it goes from the inner end to the outer end of the body 123a.

When the virtual first circumference corresponding to the inner end of the rotor core 123 is compared with the virtual second circumference corresponding to the outer end of the rotor core 123, the second circumference is larger than the first circumference. If the first working surface 124a of the permanent magnet 124 extends in a direction parallel to the radial direction of the rotor 120, the area according to the difference between the first circumference and the second circumference is determined by the rotor core 123. Must be filled. In order to fill the area, the width of the body 123a based on the circumferential direction of the rotor 120 is formed to gradually widen from the inner end to the outer end. Accordingly, the plurality of rotor cores 123 and the plurality of permanent magnets 124 in the circumferential direction of the rotor 120 may be arranged without empty space.

The head 123b protrudes on both sides from the inner end of the body 123a toward the circumferential direction of the rotor 120. Two heads 123b are formed on one rotor core 123.

Two heads 123b are formed at a position facing the inner surface of the permanent magnet 124 based on one permanent magnet 124. These two heads 123b limit the movement of the permanent magnet 124 toward the axis of rotation. One of the two heads 123b corresponds to the head 123b of the rotor core 123 disposed on one side of the permanent magnet 124, and the other one is disposed on the other side of the permanent magnet 124 Corresponds to the head 123b of the core 123.

The two heads 123b are spaced apart from each other in the circumferential direction of the rotor 120. When the two heads 123b are connected to each other, the performance of the motor 100 is deteriorated. In order to maximize the performance of the motor 100, it is preferable that all the rotor cores 123 are spaced from each other, and all the permanent magnets 124 are spaced from each other. Therefore, it is preferable from the viewpoint of performance of the motor 100 that these two heads 123b are also spaced apart from each other.

The protrusion 123c protrudes from the outer end of the body 123a. The projections 123c extend in two directions toward directions away from each other to form the rotor core slot 123e. Two protrusions 123c are formed on one rotor core 123. The two protrusions 123c protrude toward a direction inclined to the radial direction of the rotor 120. Both sides of the protrusion 123c are disposed to face the second working surface 124b of the permanent magnet 124, and are in surface contact with the second working surface 124b.

Two projections 123c are formed at a position facing the outer surface of the permanent magnet 124 based on one permanent magnet 124. These two protrusions 123c constrain the permanent magnet 124 that is trying to move toward the direction away from the rotation axis by centrifugal force when the motor 100 is operated. One of the two projections 123c corresponds to the projection 123c of the rotor core 123 disposed on one side of the permanent magnet 124, and the other one is disposed on the other side of the permanent magnet 124 Corresponds to the projection 123c of the core 123.

The two projections 123c are spaced apart from each other in the circumferential direction of the rotor 120. When the two protrusions 123c are connected to each other, the performance of the motor 100 is deteriorated. In order to maximize the performance of the motor 100, it is preferable that all the rotor cores 123 are spaced from each other, and all the permanent magnets 124 are spaced from each other. Therefore, it is preferable from the viewpoint of the performance of the motor 100 that these two projections 123c are also spaced apart from each other.

The hole 123d is formed in the body 123a. The hole 123d is opened toward a direction parallel to the axial direction of the rotation axis (up and down directions in Figs. 2 and 3). The hole 123d is formed between the inner end and the outer end of the body 123a in the radial direction of the rotor 120. Since the rotor core slot 123e is formed at the outer end of the body 123a, a hole is formed between the inner end of the body 123a and the rotor core slot 123e in the radial direction of the rotor 120.

The rotor core slot 123e is formed between two projections 123c in the circumferential direction of the rotor 120. The rotor core slot 123e may be understood as a shape recessed toward the body 123a between the two protrusions 123c based on the radial direction of the rotor 120. The circumference of the rotor core slot 123e is formed as a semicircle or a curved surface having a cross-section of a shape equivalent to a semicircle.

The hole 123d and the rotor core slot 123e are areas in which a mold pin is accommodated in an insert injection process, which will be described later, or a molten injection material is accommodated. For insert injection, a plurality of rotor cores 123 must be seated in the mold, and the plurality of rotor cores 123 must be fixed in place in the mold. In order to fix each rotor core 123 in place, a plurality of mold pins are formed in the mold. When the rotor core 123 is disposed in the mold such that each mold pin is inserted into the hole 123d or the rotor core slot 123e, fixing of the rotor core 123 is completed.

When a plurality of rotor cores 123 are seated at a fixed position in a mold using a mold pin, when injection materials in a molten state are injected into the molds, the injection material is filled in the holes 123d and the rotor core slots 123e. Lose. When the insert injection is completed and the injection molded product is separated from the mold, a hole 123d and a rotor core slot 123e remain in the region where the mold pin was present. In addition, a rotor frame pin 121g and a pin reinforcement rib 121h, which will be described later, are formed in the region filled with the injection material.

The mac 123f is formed for each sheet of electrical steel constituting each rotor core 123. The pulse 123f protrudes from one surface of each electric steel sheet, and is formed in a protrusion shape that is recessed from the other surface of the same position as the protruding position. The pulsation 123f may be formed in plural around the hole 123d, and the drawing shows a configuration in which three pulsations 123f are formed in each electric steel sheet.

The mac 123f is a structure for stacking and stacking sheets of electrical steel sheets at positions corresponding to each other. When a plurality of electrical steel sheets are stacked in such a way that one protruding mac 123f of two electrical steel plates arranged to face each other is inserted into the other recessed mac 123f, constituting the rotor core 123 The electrical steel sheets can be aligned with each other along a direction parallel to the axial direction of the rotating shaft.

The plurality of rotor cores 123 are exposed inside the rotor 120 in the radial direction of the rotor 120. Here, the inside of the rotor 120 refers to a position where the bushing 122 is installed.

On the other hand, a plurality of permanent magnets 124 are arranged in a plurality of permanent magnets formed by the plurality of rotor cores 123 so as to be alternately arranged one by one with the plurality of rotor cores 123 along the circumferential direction of the rotor 120. It is inserted one by one into the slot MS. Since the plurality of permanent magnets 124 and the plurality of rotor cores 123 are alternately arranged one by one, the rotor 120 is provided with the same number of permanent magnets 124 and the rotor core 123.

Each permanent magnet 124 has a first working surface 124a and a second working surface 124b. The magnetic force lines of the permanent magnet 124 are generated at the first working surface 124a and the second working surface 124b.

The first working surface 124a corresponds to the widest surface of the permanent magnet 124. The first working surface 124a faces the circumferential direction of the rotor 120. The first working surface 124a may be parallel to the radial direction of the rotor 120. The first working surface 124a faces the side surface of the body 123a in the circumferential direction of the rotor 120. The first working surface 124a is in surface contact with the side surface of the body 123a.

The second working surface 124b forms a boundary between the first working surface 124a and an obtuse angle. When the second working surface 124b forms an obtuse boundary with the first working surface 124a, the second working surface 124b is formed to be inclined in the radial direction of the rotor 120. When the direction away from the rotation axis is called the inside direction of the rotor 120 in the direction toward the rotation axis, and the outside direction of the rotor 120, the second working surface 124b is compared to the first working surface 124a. ).

When the first working surface 124a and the second working surface 124b form an obtuse boundary, corners are formed at the boundary between the first working surface 124a and the second working surface 124b. The edge is parallel to the axial direction of the axis of rotation.

When the first working surface 124a and the second working surface 124b form an obtuse boundary, the width of the permanent magnet 124 based on the circumferential direction of the rotor 120 is the first working surface 124a ) And gradually decreases from the boundary between the second working surface 124b to the outer end of the permanent magnet 124. The outer end of the permanent magnet 124, which is gradually narrowed by the second working surface 124b, corresponds to the gradually expanding projection 123c of the rotor core 123.

When the plurality of permanent magnets 124 are viewed from the inside of the rotor 120 based on the radial direction of the rotor 120, the plurality of permanent magnets 124 may include a plurality of rotor cores 123 and the rotor frame 121. It is covered by the inner column 121f. And when the plurality of permanent magnets 124 are viewed from the outside of the rotor 120, the plurality of permanent magnets 124 are covered by the outer wall 121e of the rotor frame 121. Here, the inside of the rotor 120 refers to a position where the bushing 122 is installed. And the outer side of the rotor 120 refers to a position corresponding to the opposite side of the bushing 122 in the radial direction with respect to the plurality of rotor cores 123 or the plurality of permanent magnets 124.

Each of the plurality of rotor cores 123 and the plurality of permanent magnets 124 includes first and second ends in a direction parallel to the axial direction of the rotating shaft. Here, the first stage refers to the bottom of the plurality of rotor cores 123 and the bottom of the plurality of permanent magnets 124 based on the direction illustrated in FIG. 2. And the second stage refers to the top of the plurality of rotor cores 123 and the top of the plurality of permanent magnets 124.

However, in that the ordinals 1 and 2 are booked to distinguish each other, the ordinal does not have any special meaning. Therefore, the upper ends of the plurality of rotor cores 123 and the upper ends of the plurality of permanent magnets 124 may be referred to as first stages. Also. The lower end of the rotor core 123 and the lower ends of the plurality of permanent magnets 124 may be referred to as second stages.

The detailed structure of the rotor frame 121 will be described with reference to FIGS. 2 to 4.

The rotor frame 121 is connected to the rotating shaft through the bushing 122 installed in the bushing coupling part 121a at a position facing the center of the stator 110. The rotor frame 121 is formed to fix the plurality of rotor cores 123 and the plurality of permanent magnets 124. When a plurality of rotor cores and a plurality of permanent magnets 124 are put into a mold and the rotor frame 121 is formed, the rotor frame 121 may include the plurality of rotor cores 123 and the plurality of permanent magnets 124. It is integrated with.

Here, the meaning of integration means that one body is formed by insert injection, which will be described later. The assembly is formed by sequentially joining the parts together, and can be dismantled in the reverse order of the joining. On the contrary, there is no concept of assembly or disassembly in the integrated body, so it is different from the assembly in that it is not disassembled unless it causes damage.

The rotor frame 121 is hollow as a whole and is formed in a cylindrical shape having any one bottom surface. The rotor frame 121 includes a bushing coupling portion 121a, a spoke 121b, a first stage base 121c, a second stage base 121d, an outer wall 121e, a plurality of inner pillars 121f, It includes a rotor frame pin (121g), a pin reinforcement rib (121h), a rotor frame hole (121i), a plurality of rotor core fixing jig hole (121j), and a plurality of permanent magnet fixing jig hole (121k).

The bushing coupling portion 121a and the spoke 121b have already been described with reference to FIG. 1 above.

The first end base 121c is formed in an annular shape to cover the first end of the plurality of rotor cores 123 and the first end of the plurality of permanent magnets 124. The first stage base 121c is formed around the outer periphery of the spoke 122b. The first end base 121c covers the first end of the plurality of rotor cores 123 and the first end of the plurality of permanent magnets 124 in a direction (lower side) parallel to the axial direction of the rotation axis. The first stage base 121c supports the first stage of the plurality of rotor cores 123 and the first stage of the plurality of permanent magnets 124.

The second end base 121d is formed in an annular shape to cover the second end of the plurality of rotor cores 123 and the second end of the plurality of permanent magnets 124. The second stage base 121d covers the second stage of the plurality of rotor cores 123 and the second stage of the plurality of permanent magnets 124 in a direction parallel to the axial direction of the rotation axis. The second end base 121d supports the second end of the plurality of rotor cores 123 and the second end of the plurality of permanent magnets 124.

The first end base 121c and the second end base 121d are formed at positions spaced apart from each other in a direction parallel to the axial direction of the rotation axis. The first end base 121c and the second end base 121d are arranged to face each other in a direction parallel to the axial direction of the rotation axis. The movement of the plurality of rotor cores 123 and the movement of the plurality of permanent magnets 124 toward the direction parallel to the axial direction of the rotation axis is prevented by the first stage base 121c and the second stage base 121d.

The outer wall 121e is formed to surround the protrusions 123c of the plurality of rotor cores 123 and the outer ends of the plurality of permanent magnets 124 in the radial direction of the rotor 120. As will be described later, the rotor frame pin 121g is inserted into the rotor core slot 123e, and the outer wall 121e shows the outer sides of the rotor core 123 and the rotor frame pin 121g in the radial direction of the rotor 120. It is formed to wrap. For example, the outer wall 121e extends in a direction parallel to the axial direction of the rotation axis to connect the first end base 121c and the second end base 121d to each other, and the outer end and the second end of the first end base 121c It extends along the outer end of the base (121d).

The outer wall 121e is formed on the outermost portion of the rotor frame 121. Therefore, the plurality of rotor cores 123 and the plurality of permanent magnets 124 are all covered by the outer wall 121e outside the rotor 120.

The plurality of inner pillars 121f extend in a direction parallel to the axial direction of the rotation axis so as to connect the inner ends of the first end base 121c and the inner ends of the second end base 121d to each other. Here, the inner end refers to a circumferential portion corresponding to the inner diameter of the rotor frame 121.

The plurality of inner pillars 121f are formed at positions spaced apart from each other along the circumferential direction of the rotor frame 121. Here, the circumferential direction of the rotor frame 121 refers to the circumferential direction of the inner end of the first end base 121c and / or the circumferential direction of the inner end of the second end base 121d.

Since the plurality of inner pillars 121f are spaced apart from each other, the opening O for each region defined by the inner end of the first end base 121c, the inner end of the second end base 121d, and the inner pillar 121f Is formed.

The inner ends of the plurality of rotor cores 123 are exposed in the radial direction of the rotor 120 through the opening O. The inner end of the rotor core 123 refers to the inner end of the body 123a. The inner end of the rotor core 123 exposed in the radial direction of the rotor 120 faces the stator 110.

Referring to FIG. 2, a plurality of rotor cores 123 and a plurality of inner pillars 121f are alternately formed one by one along the circumferential direction of the first frame 121. In addition, the plurality of permanent magnets 124 are covered by the plurality of rotor cores 123 and the plurality of inner pillars 121f in the radial direction of the first frame 121.

The head 123b of each rotor core 123 and each inner pillar 121f are in surface contact in a direction inclined with respect to the radial direction of the rotor frame 121. Therefore, the plurality of inner pillars 121f support the plurality of rotor cores 123 in the radial direction. And the movement of the plurality of rotor cores 123 toward the inside of the rotor frame 121 (toward the axis of rotation) is prevented by the plurality of inner pillars 121f.

The plurality of rotor frame pins 121g protrude from the first end base 121c toward the second end base 121d. The plurality of rotor frame pins 121g extend along a direction parallel to the axial direction of the rotation axis. In some cases, a plurality of rotor frame pins 121g may protrude from the second stage base 121d toward the first stage base 121c.

The plurality of rotor frame pins 121g is formed between the inner end of the first end base 121c and the outer wall 121e in the radial direction of the rotor frame 121. In addition, the plurality of rotor frame pins 121g may be formed at positions spaced apart from each other along the circumferential direction of the rotor frame 121. It is also possible that two or more rotor frame pins 121g are formed in the same radial direction.

When two or more rotor frame pins 121g are formed in the same radial direction, one is formed at a position relatively away from the outer wall 121e, and the other is formed at a position relatively close to the outer wall 121e. The rotor frame pin 121g formed at a position relatively away from the outer wall 121e is inserted into the hole 123d of the rotor core 123.

A pin reinforcement rib 121h for reinforcing the connection strength with the outer wall 121e may be formed around the rotor frame pin 121g formed relatively close to the outer wall 121e in the same radial direction. The pin reinforcement ribs 121h may be formed on both sides of each rotor frame pin 121g. The pin reinforcement rib 121h is formed to connect the rotor frame pin 121g and the outer wall 121e. The pin reinforcement rib 121h may have the same height as the rotor frame pin 121g in a direction parallel to the axial direction of the rotation axis. The rotor frame pin 121g formed relatively close to the outer wall 121e and the pin reinforcement ribs around it are inserted into the rotor core slot 123e of the rotor core.

When the rotor frame 121 is formed by insert injection, a rotor frame pin 121g and a pin reinforcement rib 121h are formed in an area filled with molten injection raw material. Therefore, the rotor frame pin 121g formed at a position relatively away from the outer wall 121e has a shape corresponding to the hole 123d of the rotor core 123. In addition, the rotor frame pin 121g formed relatively close to the outer wall 121e and the pin reinforcement ribs 121h around it have a shape corresponding to the rotor core slot 123e.

The rotor frame hole 121i is formed at a position facing the rotor frame 121 along a direction parallel to the axial direction of the rotation axis. When the rotor frame pin 121g is formed in the first stage base 121c, the rotor frame hole 121i is formed in the second stage base 121d. Conversely, when the rotor frame pin 121g is formed in the second end base 121d, the rotor frame hole 121i is formed in the first end base 121c.

The rotor frame hole 121i is a seat where a mold pin was originally placed during injection molding for the manufacture of the rotor 120. Even if the molten raw material for insert injection is filled in the mold, the molten injection raw material is filled only above or below the mold pin, and the molten injection raw material cannot exist at the position where the mold pin is present. Therefore, as a result of insert injection, rotor frame pins 121g and pin reinforcement ribs remain in the area where the molten injection material is present, and rotor frame holes 121i remain in the area where the mold pins exist.

When the insert injection complete rotor 120 is separated from the mold, the rotor 120 is released from the mold pin. It can be understood that the distance between the rotor frame pin 121g and the rotor frame hole 121i corresponds to the length of the mold pin. And it can be understood that the sum of the length of the mold pin and the length of the rotor frame pin 121g is a distance between the first end base 121c and the second end base 121d. Therefore, the length of the rotor frame pin 121g in the direction parallel to the axial direction of the rotation axis is shorter than the distance H between the first end base 121c and the second end base 121d.

The plurality of rotor core fixing jig holes 121j may be formed in any one of the first end base 121c and the second end base 121d. The plurality of rotor core fixing jig holes 121j may be formed along the circumference between the outer wall 121e and the inner column 121f. The plurality of rotor core fixing jig holes 121j are formed at positions spaced apart from each other.

A rotor core fixing jig for fixing a plurality of rotor cores 123 may be formed in a mold for manufacturing the rotor 120. The rotor core fixing jig adheres each rotor core 123 seated on the mold pin to the mold pin along a direction parallel to the axial direction of the rotating shaft. Therefore, each rotor core 123 can be fixed along this direction.

Even if the molten raw material for insert injection is filled in the mold, the molten raw material cannot exist at the position where the rotor core fixing jig is present. Therefore, as a result of insert injection, the rotor core fixing jig hole 121j remains.

The permanent magnet fixing jig hole 121k is formed at the boundary between the first end base 121c and the inner column 121f, or is formed at the boundary between the second end base 121d and the inner column 121f. The permanent magnet fixing jig hole 121k is formed at each position corresponding to each permanent magnet 124 in the radial direction of the rotor frame 121.

A permanent magnet fixing jig for fixing a plurality of permanent magnets 124 may be formed in a mold for manufacturing the rotor 120. The permanent magnet fixing jig adheres each of the permanent magnets 124 mounted on the mold pin to the mold pin along a direction parallel to the axial direction of the rotation axis. Therefore, each permanent magnet 124 can be fixed along this direction.

Even if the molten raw material for insert injection is filled in the mold, the molten raw material cannot exist in the position where the permanent magnet fixing jig exists. Therefore, as a result of insert injection, a permanent magnet fixing jig hole 121k remains. Since the permanent magnet 124 is visually exposed through the permanent magnet fixing jig hole 121k, the position of the permanent magnet 124 is visually confirmed from the outside of the rotor frame 121 through the permanent magnet fixing jig hole 121k. Can be.

When the head 123b is formed on the rotor core 123, tilting of the permanent magnet 124 in the mold toward the rotational axis direction can be prevented. Therefore, the permanent magnet fixing jig hole 121k is not formed at the boundary between the first end base 121c and the outer wall 121e or the boundary between the second end base 121d and the outer wall 121e.

Hereinafter, the size, shape, and the like of the rotor core 123 and the permanent magnet 124 will be described.

5 is a plan view of the rotor core 123 and the permanent magnet 124.

As described above, the rotor core 123 serves to concentrate the force generated by the permanent magnet 124. Since the rotor core 123 provides a path of magnetic flux, the magnetic flux is concentrated by the rotor core 123. The structure in which the rotor cores 123 are completely spaced apart from each other and the permanent magnets 124 are completely spaced apart from each other (so-called fully divided structures) is most preferable from the viewpoint of the performance of the motor 100.

However, the fully divided structure causes scattering of the plurality of rotor cores 123 and the plurality of permanent magnets 124 by strong centrifugal force. Therefore, in order to prevent scattering of the plurality of rotor cores 123 and the plurality of permanent magnets 124, even if the volumes of the rotor core 123 and the permanent magnets 124 are slightly sacrificed, the plurality of rotor cores 123 and the plurality of permanents A structure for constraining the magnet 124 is essential.

The hole 123d formed in the rotor core 123 or the rotor core slot 123e is a configuration for fixing the rotor core 123 by inserting the rotor frame pin 121g. However, when a hole 123d or a rotor core slot 123e is formed in the rotor core 123, a decrease in the performance of the motor 100 occurs due to a reduction in the volume of the rotor core 123. Therefore, the shape, size, position, etc. of the hole 123d or the rotor core slot 123e affects the structural strength of the rotor 120 and the performance of the motor 100. For example, it can be seen that the structural strength of the rotor 120 and the performance of the motor 100 are in a kind of trade off relationship.

The present invention proposes the size and shape of the rotor core 123 and the permanent magnet 124 that can suppress the performance degradation of the motor 100 while increasing the structural strength of the rotor 120.

First, the position of the hole 123d formed in the rotor core 123 will be described. The size and shape of the two permanent magnets 124 disposed on both sides of the rotor core 123 are the same. Therefore, the magnetic force lines generated from the permanent magnet 124 disposed on one side of the rotor core 123 and the magnetic force lines generated from the permanent magnet 124 disposed on the other side of the rotor core 123 are symmetrical to each other.

In order to minimize the effect on the magnetic force lines generated by the permanent magnets 124 on both sides due to the holes 123d formed in the rotor core 123, holes 123d are formed in the center of the body 123a in the circumferential direction of the rotor. Should be. If the hole 123d is deviated from the center of the body 123a, the magnetic force lines generated by any one of the permanent magnets 124 on both sides are saturated, causing the performance of the motor 100 to deteriorate.

Also, the hole 123d is formed close to the outer end of the inner and outer ends of the body 123a. Since the size of the first working surface 124a is larger than that of the second working surface 124b, the magnetic force line is generated more in the first working surface 124a. In the radial direction of the rotor 120, the first working surface 124a is formed inside compared to the second working surface 124b, so that the hole 123d is disposed close to the outer end, so that the inner end and the hole of the body 123a ( The area between 123d) (the area providing the path of the magnetic field line) becomes wider.

Next, the size of the hole 123d will be described. When the diameter of the hole 123d is A and the straight distance between both sides of the rotor core 123 is B, the ratio (A / B) of the two distances is preferably 0.4 to 0.7. The distance between both sides of the rotor core 123 corresponds to the distance between both sides of the body 123a. However, since the width of the body 123a in the circumferential direction of the rotor 120 gradually increases from the inner end to the outer end, it may not be a constant value. Therefore, as a straight line distance B between both sides of the body 123a, a straight line distance connecting the middle portions of both sides to each other may be selected. This straight line distance corresponds to the average value of various B values that are not constant.

If the ratio (A / B) is smaller than 0.4, the size of the hole 123d, the rotor frame pin 121g inserted into the hole 123d, and the size of the mold pin are also reduced. This may be insufficient to improve the structural strength of the rotor 120. Conversely, if the ratio (A / B) is greater than 0.7, the hole 123d is excessively large, causing the performance of the motor 100 to deteriorate. If the straight line distance B between both sides of the body 123a is 8.8mm, and the diameter A of the hole 123d is 5mm, the ratio A / B is 0.57, and this ratio is within the above range. That's an appropriate figure.

The straight distance between the hole 123d and the rotor core slot 123e and the straight distance between the hole 123d and the pulse 123f are also factors determining the structural strength of the rotor core 123. If these distances are set to a sufficiently large value, there is no influence on the structural strength of the rotor core 123. However, if the straight line distance between the hole 123d and the rotor core slot 123e is less than 0.45 mm, damage to the rotor core 123 may occur between the hole 123d and the rotor core slot 123e. In addition, if the straight line distance between the hole 123d and the pulse 123f is less than 0.45 mm, damage to the rotor core 123 may occur between the hole 123d and the pulse 123f. Therefore, it is preferable that both the straight line distance between the hole 123d and the rotor core slot 123e and the straight line distance between the hole 123d and the pulse 123f are 0.45 mm or more.

On the other hand, the straight line distance (B) between both sides of the body (123a) is formed to gradually move away from the outer side of the rotor core (123). In addition, the straight line distance C between both sides 123c1 and 123c2 formed on the outer side of the two protrusions 123c is also formed to gradually get farther toward the outer side of the rotor core 123. Corresponding to the fact that the first working surface 124a and the second working surface 124b form an obtuse angle boundary, the C is farther away from the B. For example, as the length of the same radial direction goes to the outside of the rotor core 123, the increase in the C value is greater than the increase in the B value.

This shape allows the two protrusions 123c to be in close contact with the second working surface 124b of the permanent magnet 124 on the outside of the rotor core 123 to constrain the permanent magnet 124. Accordingly, the permanent magnet 124 is constrained by any one projection 123c of the rotor core 123 disposed on one side and one projection 123c of the rotor core 123 disposed on the other side, and in the radial direction Movement is restricted.

On the other hand, the size of the obtuse angle formed by the boundary between the first working surface 124a and the second working surface 124b and the size of the permanent magnet 124 are similar to the above, the performance of the motor 100 and the structure of the rotor 120 It should be set to an appropriate value in terms of strength.

The size of the obtuse angle θ1 formed by the boundary between the first working surface 124a and the second working surface 124b is preferably 190 ° to 230 °. If the size of the obtuse angle θ1 is smaller than 190 °, the effect of preventing scattering is insufficient. Conversely, if the size of the obtuse angle θ1 is greater than 230 °, the volume of the permanent magnet 124 decreases, causing performance deterioration of the motor 100.

The rotor core 123 also has a boundary of an obtuse angle θ2 corresponding to the boundary between the first working surface 124a and the second working surface 124b. For example, the side surface of the body 123a and the side surface of the projection 123c also form a boundary between the obtuse angles θ2. The size of the obtuse angle θ2 formed by the side surface of the body 123a and the side surface of the protrusion 123c is also 190 ° to 230 °. Accordingly, the side surface of the body 123a is in close contact with the first working surface 124a, and the side surface of the protrusion 123c is in close contact with the second working surface 124b.

On the other hand, since the rotor frame pin 121g and the pin reinforcement rib 121h are inserted into the rotor core slot 123e, the boundary of the obtuse angle θ3 is also formed around the rotor core slot 123e.

When the radial length of the permanent magnet 124 is E and the radial length of the first working surface 124a is F, the second working surface 124b based on the radial direction of the rotor 120 The radial length D may be defined as D = EF. Originally, since the second working surface 124b of the permanent magnet 124 is arranged to be inclined with respect to the radial direction, the length of the second working surface 124b should be measured based on the inclined direction. However, if the concept of the radial length of the second working surface 124b is to be introduced, D = E-F may be defined as described above.

The ratio (D / E) of the radial length D of the second working surface 124b and the radial length E of the permanent magnet 124 is preferably 0.15 to 0.35. If the ratio (D / E) is less than 0.15, the size of the permanent magnet 124 is reduced, causing the performance of the motor 100 to deteriorate. Conversely, if the ratio (D / E) is greater than 0.35, the anti-scattering effect is insufficient.

On the other hand, the permanent magnet 124 has an inner surface disposed to face the stator 110 in the radial direction of the rotor 120 and an outer surface disposed to face the opposite side of the inner surface. If the length of the outer surface based on the circumferential direction of the rotor 120 is I and the length of the inner surface is J, the ratio (I / J) of I and J is preferably 0.6 to 0.8. If the ratio (I / J) is less than 0.6, the size of the permanent magnet 124 is reduced, causing the performance of the motor 100 to deteriorate. Conversely, if the ratio (I / J) is greater than 0.8, the emergency prevention effect is insufficient.

Hereinafter, another embodiment of the present invention will be described.

6 is a plan view showing another embodiment of the rotor core 223 and the permanent magnet 224.

The permanent magnet 224 has one working surface 224a on each side. The distance L between the two working surfaces 224a gradually approaches the inner side of the permanent magnet 224 toward the outer end. In addition, the permanent magnet 224 has a cross section in which the left and right sides are symmetrical with respect to an imaginary straight line extending along the radial direction of the rotor 120.

The rotor core 223 includes a body 223a, a head 223b, holes 223d1, 223d2, 223d3 and a mac 223f.

For a description of the body 223a and the head 223b, refer to the above-described embodiment.

The holes 223d1, 223d2, and 223d3 are formed in plural. The plurality of holes 223d1, 223d2, and 223d3 are formed at positions spaced apart from each other along the radial direction of the rotor 120. Each hole 223d may be referred to as a first hole 223d1, a second hole 223d2, and a third hole 223d3 from the inner end of the rotor core 223. The first hole 223d1 is formed in a circular cross section. The second hole 223d2 and the third hole 223d3 may have an annular sector shape, and the third hole 223d3 may be larger than the second hole 223d2.

The pulse 223f is formed in plurality around the first hole 223d1. As described above, the distance between the mac 223f and the first hole 223d1 is preferably 0.45 mm or more. Since the mac 223f is formed between the first hole 223d1 and the second hole 223d2, it is preferable that the distance between the mac 223f and the second hole 223d2 is 0.45 mm or more.

Both sides 223a1 of the rotor core 223 are symmetrical to each other based on the radial direction of the rotor core 223. The distance K between both sides of the body 223a gradually increases from the inner end of the rotor core 223 to the outer end.

The shape of the rotor core 223 and the permanent magnet 224 prevents radial scattering of the permanent magnet 224.

7 is a plan view showing another embodiment of the rotor core 323 and the permanent magnet 324.

The permanent magnet 324 has an asymmetric cross section with respect to the left and right sides based on an imaginary straight line extending along the radial direction of the rotor 120. One of the two working surfaces 324a1 and 324a2 of the permanent magnet 324 is inclined with respect to the radial direction of the rotor 120, and the other 324a1 is parallel to the radial direction of the rotor 120. . Accordingly, the distance between the two working surfaces 324a of the permanent magnet 324 gradually approaches the outer end of the permanent magnet 324.

The rotor core 323 also has a shape corresponding to the permanent magnet 324. One of both sides 323a1 and 323a2 of the body 323a is formed parallel to the radial direction of the rotor 120 (323a2), and the other 323a1 is formed to be inclined with respect to the radial direction of the rotor 120 . Accordingly, the straight line distance K between both sides 323a1 and 323a2 of the rotor core 323 gradually increases toward the outer end of the rotor core 323.

The side surface 323a2 parallel to the radial direction of the rotor 120 and the working surface 324a1 parallel to the radial direction of the rotor 120 face each other and are in close contact with each other. The side surface 323a1 inclined in the radial direction of the rotor 120 and the working surface 324a2 inclined in the radial direction of the rotor 120 also face each other and are in close contact with each other.

The shape of the rotor core 323 and the permanent magnet 324 prevents radial dispersion of the permanent magnet 324.

8 is a plan view showing another embodiment of the rotor core 423 and the permanent magnet 424.

The permanent magnet 424 is formed in the shape of an annular sector. One of the two working surfaces 424a1 and 424a2 of the permanent magnet 424 is formed as a convex curved surface, and the other 424b2 is formed as a concave curved surface.

The body 423a of the rotor core 423 includes a first side 423a1 and a second side 423a2.

The first side 423a1 is formed in a convex curved surface to correspond to the concave working surface 424a2 of the permanent magnet 424 disposed on one side of the rotor core 423 in the circumferential direction of the rotor 120. The concave working surface 424a2 of the permanent magnet 424 and the first side surface 423a1 are in surface contact with each other.

The second side surface 423a2 is formed in a concave curved surface to correspond to the convex working surface 424a1 of the permanent magnet 424 disposed on one side of the rotor core 423 in the circumferential direction of the rotor 120. The convex working surface 424a1 and the second side 423a2 of the permanent magnet 424 are in surface contact with each other.

The shape of the rotor core 423 and the permanent magnet 424 prevents radial dispersion of the permanent magnet 424.

9 is a plan view showing another embodiment of the rotor core 523 and the permanent magnet 524.

For the structure in which the distance between the two working surfaces 524a of the permanent magnet 524 gradually approaches the outer end of the permanent magnet 524, refer to the above-described embodiment. Similarly, for the structure in which the straight line distance B between both sides of the body 523a of the rotor core 523 gradually increases toward the outer end of the rotor core 523, refer to the above-described embodiment.

The projections 523c of the rotor core 523 protrude both sides from the outer end of the body 523a toward the circumferential direction of the rotor 120. As the protrusion 523c protrudes toward the circumferential direction of the rotor 120, the protrusion 523c may prevent scattering of the permanent magnet 524. As the protrusion 523c prevents scattering of the permanent magnet 524, the distance between the two working surfaces 524a of the permanent magnet 524 gradually approaches the outer end of the permanent magnet 524, even if it is not sudden. It is okay. According to this structure, the volume of the permanent magnet 524 is further increased, and the performance of the motor 500 can be further improved.

In FIG. 9, reference numeral 523b denotes a head, 523d1 a first hole, 523d2 a second hole, and 523d3 a third hole.

In all the embodiments described above, the ratio (A / B) of the diameter A of the holes 223d1, 323d2, 423d, and 523d1 and the straight distance B between both sides of the bodies 223a, 323a, 423a, and 523a is 0.4 to 0.7.

The motor described above is not limited to the configuration and method of the above-described embodiments, and the above-described embodiments may be configured by selectively combining all or part of each embodiment so that various modifications can be made.

Claims (19)

Stator; And
And a rotor rotatably disposed inside or outside the stator,
The rotor,
To form a plurality of permanent magnet arrangement slots are arranged spaced apart from each other along the circumferential direction of the rotor on the inside or outside of the stator, and provided with a hole formed in a direction parallel to the axial direction of the rotating shaft coupled to the rotor A plurality of rotor core segments;
A plurality of permanent magnets inserted one by one into the plurality of permanent magnet arrangement slots so as to be alternately arranged one by one with the plurality of rotor core segments along the circumferential direction of the rotor; And
A rotor frame formed to fix the plurality of rotor core segments and the plurality of permanent magnets, and including a plurality of rotor frame pins inserted into the holes,
The rotor frame,
A base formed to surround the plurality of rotor core segments and the plurality of permanent magnets in a direction parallel to the axial direction of the rotation axis; And
It includes a plurality of permanent magnet fixing jig holes formed only on the inner end of the inner and outer ends of the base to expose the plurality of permanent magnets,
Motors on both sides of the outer end of the rotor core segment, characterized in that protrusions extending in a direction away from each other are formed to support one side of the permanent magnet. According to claim 1,
Each of the plurality of rotor core segments,
A body having the hole; And
It includes a head protruding from both sides from the inner end of the body toward the circumferential direction of the rotor,
The protrusion protrudes from the outer end of the body, and extends in two directions toward directions away from each other to form a rotor core slot,
The hole is formed between the inner end of the body and the rotor core slot in the radial direction of the rotor. According to claim 2,
A motor characterized in that the straight distance between the hole and the rotor core slot based on the radial direction of the rotor is 0.45 mm or more. According to claim 2,
The rotor core segment is formed by laminating a sheet of electrical steel sheet,
The body has a pulse formed around the hole,
The pulsations protrude from one surface of each electrical steel sheet, and are formed by recessing from the other surface of the same position,
A motor characterized in that the straight line distance between the hole and the pulse is 0.45 mm or more. According to claim 2,
The straight line distance (B) between both sides of the body is formed to gradually move away from the outer side of the rotor core segment,
The straight line distance (C) between both sides formed on the outer side of the two projections is formed to gradually move away from the outer side of the rotor core segment,
A motor characterized in that the straight line distance (C) between both sides formed on the outer side of the two projections is far more rapidly than the straight line distance (B) between both sides of the body. According to claim 2,
Each of the plurality of permanent magnets,
A first working surface facing the circumferential direction of the rotor; And
And a second working surface forming a boundary between the first working surface and an obtuse angle,
The side surface of the body is in surface contact with the first working surface,
The side surface of the protrusion forms a boundary between the side surface and the obtuse angle of the body so as to make surface contact with the second working surface. The method of claim 6,
The obtuse angle is a motor, characterized in that 190 ° to 230 °. The method of claim 6,
The radial length D of the second working surface based on the radial direction of the rotor is the difference between the radial length E of the permanent magnet and the radial length F of the first working surface (D = EF),
The ratio (D / E) of the radial length (D) of the second working surface and the radial length (E) of the permanent magnet is 0.15 to 0.35. According to claim 1,
The plurality of rotor core segments and the plurality of permanent magnets each have first and second ends located opposite to each other in a direction parallel to the axial direction of the rotating shaft,
The rotor frame,
A first end base formed to surround the first end in a direction parallel to the axial direction of the rotating shaft; And
And a second stage base formed to surround the second stage in a direction parallel to the axial direction of the rotation axis,
A motor characterized in that the length (G) of the rotor frame pin in a direction parallel to the axial direction of the rotation axis is shorter than the distance (H) between the first end base and the second end base (G <H). . According to claim 1,
The plurality of rotor core segments and the plurality of permanent magnets each have first and second ends located opposite to each other in a direction parallel to the axial direction of the rotating shaft,
The base,
A first end base formed to surround the first end in a direction parallel to the axial direction of the rotating shaft; And
And a second end base formed to surround the second end in a direction parallel to the axial direction of the rotation axis,
The plurality of permanent magnet fixing jig hole is a motor characterized in that it is formed only on the inner end of the inner end and the outer end of the first end base or the second end base. The method of claim 10,
The rotor frame has a plurality of inner pillars extending in a direction parallel to the axial direction of the rotation axis to connect the inner ends of the first end base and the inner ends of the second end base to each other,
The plurality of permanent magnet fixing jig holes are formed for each boundary between the first end base and the plurality of inner pillars, or the second end base and the plurality of inner pillars. The method of claim 10,
The plurality of permanent magnet fixing jig holes are characterized in that the motor is formed at a position spaced apart from each other along the circumferential direction of the rotor frame. According to claim 1,
The plurality of rotor core segments and the plurality of permanent magnets each have first and second ends located opposite to each other in a direction parallel to the axial direction of the rotating shaft,
The rotor frame,
A first end base formed to surround the first end in a direction parallel to the axial direction of the rotating shaft;
A second stage base formed to surround the second stage in a direction parallel to the axial direction of the rotating shaft; And
It characterized in that it comprises a plurality of rotor frame holes formed in one of the first end base and the second end base, and formed at each position facing the rotor frame pin in a direction parallel to the axial direction of the rotation axis. Motor. According to claim 1,
Each of the plurality of permanent magnets,
An inner surface disposed to face the stator; And
It has an outer surface disposed to do the opposite side of the inner surface,
A motor characterized in that the ratio (I / J) of the length (I) of the outer surface and the length (J) of the inner surface is 0.6 to 0.8 based on the circumferential direction of the rotor. According to claim 1,
The straight line distance (K) between both sides of the rotor core segment gradually increases toward the outer end of the rotor core segment,
Motors characterized in that both sides of the rotor core segment are symmetrical to each other based on the radial direction of the rotor. According to claim 1,
The straight line distance (K) between both sides of the rotor core segment gradually increases toward the outer end of the rotor core segment,
Any one of both sides of the rotor core segment is formed parallel to the radial direction of the rotor,
The other of the two sides of the rotor core segment, characterized in that the motor is formed inclined with respect to the radial direction of the rotor. According to claim 1,
Each of the plurality of permanent magnets has two working surfaces facing each other,
One of the two working surfaces is formed as a concave curved surface,
The other of the two working surfaces is formed as a convex curved surface,
Each of the plurality of rotor core segments,
A first side surface formed in a convex curved surface in surface contact with the concave working surface of the permanent magnet disposed on one side of the rotor core segment in the circumferential direction of the rotor; And
And a second side surface formed in a concave curved surface in surface contact with the convex working surface of the permanent magnet disposed on the other side of the rotor core segment in the circumferential direction of the rotor. According to claim 1,
Each of the plurality of rotor core segments,
A body having the hole;
A head protruding to both sides from the inner end of the body toward the circumferential direction of the rotor; And
And a protrusion protruding to both sides from an outer end of the body toward a circumferential direction of the rotor. According to claim 1,
The ratio (A / B) of the diameter (A) of the hole and the straight line distance (B) between both sides of the rotor core segment is 0.4 to 0.7.

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